Names That Mean Immortality

Tansy is a flower name rarer than Rose, livelier than Lily and a lot less teasable than Pansy.

Thanos originated as a short form of Athanasios, a Greek name meaning "immortal." It is composed of the elements a, a negative Greek prefix, and thanatos, meaning "death." St. Athanasius, who used the Latin spelling of the name, was a bishop of Alexandria and known for his opposition to Arianism.